Joomla is one of the most popular, flexible and scalable open source CMSs and application development frameworks available to date. Practically any kind of application (big or small, complex or simple) can be built on Joomla. ebay has used Joomla for developing a community portal as part of eBay’s internal analytics platform. Pizza Hut uses Joomla for its main website in France. These examples show the ability of Joomla as a CMS and framework to help building bigger applications.
Joomla is an content management system (CMS), which enables you to build Web sites and almighty online applications. Many features, including its ease-of-use and extensibility, have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.It is a 'free' open source framework